Excellent observation. With my mod, a character could take a free house-rule cantrip at level 1, then Magic Initiate instead of an ASI, and with the potential for racial and class cantrips, end up cantripy as heck. That would be alright.
– JackDec 5 at 17:23

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@Jack If you are worried about a character with many cantrips you may be interested in checking this question
– SdjzDec 5 at 17:26

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While true, this doesn't really answer the question. "Would it unbalance the game?" is the question, not "would anyone pick a cantrip over a feat?".
– GreySageDec 5 at 18:20

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@Jack You're missing the point... Given the choice between "a feat" and "a cantrip", nobody in their right mind would take the cantrip, because there is a feat that allows a more than just that. The existence of Magic Initiate indicates that a feat is more valuable than a single cantrip. Your game would become slightly unbalanced in favor of the people who took the feat.
– T.J.L.Dec 5 at 18:21

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I feel like this isn't actually an answer to the question. just a problem with the question that should have really been a comment.
– goodguy5Dec 5 at 19:28